scholarly journals Metal-semiconductor-metal (MSM) photodetectors with plasmonic nanogratings*

2011 ◽  
Vol 83 (11) ◽  
pp. 2107-2113 ◽  
Author(s):  
Narottam Das ◽  
Ayman Karar ◽  
Chee Leong Tan ◽  
Mikhail Vasiliev ◽  
Kamal Alameh ◽  
...  
Keyword(s):  
Light Absorption ◽  
Enhancement Factor ◽  
Signal Propagation ◽  
Optical Signal ◽  
Fdtd Simulation ◽  
Absorption Enhancement ◽  
Metal Semiconductor Metal ◽  
Simulation Results ◽  
Msm Photodetectors ◽  
Difference Time

We discuss the light absorption enhancement factor dependence on the design of nanogratings inscribed into metal-semiconductor-metal photodetector (MSM-PD) structures. These devices are optimized geometrically, leading to light absorption improvement through plasmon-assisted effects. Finite-difference time-domain (FDTD) simulation results show ~50 times light absorption enhancement for 850 nm light due to improved optical signal propagation through the nanogratings. Also, we show that the light absorption enhancement is strongly dependent on the nanograting shapes in MSM-PDs.

scholarly journals Impact of Nanograting Phase-Shift on Light Absorption Enhancement in Plasmonics-Based Metal-Semiconductor-Metal Photodetectors

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Narottam Das ◽  
Ayman Karar ◽  
Chee Leong Tan ◽  
Kamal Alameh ◽  
Yong Tak Lee
Keyword(s):  
Phase Shift ◽  
Light Absorption ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Fdtd Method ◽  
Absorption Enhancement ◽  
Force Microscopy ◽  
Atomic Force ◽  
Metal Semiconductor Metal ◽  
Difference Time

The finite difference time-domain (FDTD) method is used to simulate the light absorption enhancement in a plasmonic metal-semiconductor-metal photodetector (MSM-PD) structure employing a metal nanograting with phase shifts. The metal fingers of the MSM-PDs are etched at appropriate depths to maximize light absorption through plasmonic effects into a subwavelength aperture. We also analyse the nano-grating phase shift and groove profiles obtained typically in our experiments using focused ion beam milling and atomic force microscopy and discuss the dependency of light absorption enhancement on the nano-gratings phase shift and groove profiles inscribed into MSM-PDs. Our simulation results show that the nano-grating phase shift blue-shifts the wavelength at which the light absorption enhancement is maximum, and that the combined effects of the nano-grating groove shape and phase shift degrade the light absorption enhancement by up to 50%.

Numerical Simulation and Experimental Validation of RF Drying

1996 ◽  
Vol 430 ◽  
Author(s):  
S. Bringhurst ◽  
M. J White ◽  
M. F. Iskander
Keyword(s):  
Microwave Sintering ◽  
Fdtd Method ◽  
Fdtd Simulation ◽  
Ceramic Ware ◽  
Rf Heating ◽  
Simulation Results ◽  
Effective Use ◽  
Difference Time ◽  
Experimental Effort ◽  
Fiber Optic Temperature

AbstractThe Finite-Difference Time-Domain (FDTD) method has been used by our group to simulate a wide variety of Radio Frequency (RF) and induction-drying processes and realistic, microwave-sintering experiments. Many results were presented and some guidelines towards the effective use of the microwave and RF heating technologies of ceramic ware were developed.In this paper we describe an experimental effort which was used to validate the FDTD simulation results. Specifically an experimental RF dryer, Thermax Model No. T3GB operating at 25 MHz, was used to dry ceramic ware of various materials, sizes, and shapes and the temperature distribution pattern was monitored using six fiber-optic temperature probes. The measured heating patterns were then compared with the FDTD simulation results. Many of the guidelines developed using the numerical simulations were confirmed experimentally.Results from various comparisons between simulation and experimental data will be presented. Additional results from the simulation efforts illustrating possible procedures for improving the efficiency and the uniformity of RF drying will also be described

scholarly journals Reverse Design of On-Chip Terahertz Demultiplexers

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1093
Author(s):  
Guofeng Zhu ◽  
Feng Huang ◽  
Zhenrong Dai ◽  
Xuewei Ju ◽  
Shuncong Zhong ◽  
...  
Keyword(s):  
Finite Difference Time Domain ◽  
Design Method ◽  
Research Field ◽  
Fdtd Simulation ◽  
Terahertz Waves ◽  
Bandwidth Optimization ◽  
Simulation Results ◽  
On Chip ◽  
Adjacent Channels ◽  
Difference Time

The reverse design method (RDM) is a frontier direction in the optical research field. In this work, RDM is applied to the design of terahertz demultiplexers, including two-port and three-port terahertz demultiplexers, with areas of 3 mm × 3 mm and 5 mm × 5 mm, respectively. The Finite-Difference Time-Domain (FDTD) simulation results show that the terahertz waves at frequencies of 0.5 THz and 0.417 THz can be well separated by the two-port demultiplexer, and the transmittances of the two outputs reach as high as 0.75 after bandwidth optimization. Meanwhile, the three-port terahertz demultiplexer can have terahertz waves separated from three Ports, and the crosstalk between adjacent channels is less than −18 dB.

scholarly journals Plasmon-Enhanced Light Absorption in (p-i-n) Junction GaAs Nanowire Solar Cells: An FDTD Simulation Method Study

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
E. A. Dawi ◽  
A. A. Karar ◽  
E. Mustafa ◽  
O. Nur
Keyword(s):  
Solar Cells ◽  
Light Absorption ◽  
Au Nanoparticles ◽  
High Efficiency ◽  
Simulation Method ◽  
Absorption Efficiency ◽  
Fdtd Simulation ◽  
Absorption Enhancement ◽  
Gaas Nanowire ◽  
Vertically Aligned

AbstractA finite-difference time-domain method is developed for studying the plasmon enhancement of light absorption from vertically aligned GaAs nanowire arrays decorated with Au nanoparticles. Vertically aligned GaAs nanowires with a length of 1 µm, a diameter of 100 nm and a periodicity of 165–500 nm are functionalized with Au nanoparticles with a diameter between 30 and 60 nm decorated in the sidewall of the nanowires. The results show that the metal nanoparticles can improve the absorption efficiency through their plasmonic resonances, most significantly within the near-bandgap edge of GaAs. By optimizing the nanoparticle parameters, an absorption enhancement of almost 35% at 800 nm wavelength is achieved. The latter increases the chance of generating more electron–hole pairs, which leads to an increase in the overall efficiency of the solar cell. The proposed structure emerges as a promising material combination for high-efficiency solar cells.

scholarly journals A Comprehensive Study on the Impact of Various Nano-gratings on MSM-PDs for Enhancement in the Light Absorption

2019 ◽  
Vol 18 (1) ◽  
pp. 27-34
Author(s):  
Alif Islam ◽  
Narottam Das ◽  
Mohammad Mohiuddin Uzzal
Keyword(s):  
Light Absorption ◽  
Communication Systems ◽  
High Speed ◽  
Light Transmission ◽  
Fdtd Method ◽  
Absorption Capacity ◽  
Absorption Enhancement ◽  
Network Systems ◽  
Simulation Results ◽  
The Impact

In this paper, we have analyzed metal-semiconductor-metal photodetectors (MSM-PDs) with different nano-grating structures or shapes to improve the light absorption capacity into the device in details for high-speed communication systems and networks. The plasmonic-based MSM-PD structure demonstrates a significant improvement in light absorption capacity for the developed device compared to conventional MSM-PDs i.e., devices that have not employed the nano-gratings. The light absorption capacity of the device is varied with the variation of geometrical shapes and parameters of the nano-gratings, such as the nano-grating height, slit width and so on. These nano-grating structures are assisting in light transmission through the central slit (i.e., subwavelength apertures) efficiently, resulting in the excitation of surface plasmon polaritons (SPPs) as the incident photons interact with the nano-gratings/ nano-corrugations. This improved light transmission in the central slit along with excited SPPs results in resonant light absorption in the device. This means the light trapped inside the central slit is triggered by the SPPs to a higher order magnitude. This causes the light absorption enhancement for the device, i.e., more light is transmitted through the device instead of reflecting back to the surface. The simulation results demonstrated that the light absorption enhancement factor (LAEF) for these devices have improved dramatically due to the nano-gratings. For modeling and simulation of these devices, Opti-FDTD tool is used which is based on finite difference time domain (FDTD) method. The application of these simulated devices is in the range of 800-850-nm. The simulation results are suitable for the design of nano-structured MSM-PDs that can be used in high-speed communication systems and sensor network systems.

Non-quasi-static Effects Simulation of Microwave Circuits based on Physical Model of Semiconductor Devices

2020 ◽  
Vol 35 (9) ◽  
pp. 992-998
Author(s):  
Ke Xu ◽  
Xing Chen ◽  
Qiang Chen
Keyword(s):  
Physical Model ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Circuit Simulation ◽  
Semiconductor Devices ◽  
Simulation Method ◽  
Fdtd Simulation ◽  
Lumped Element ◽  
Simulation Results ◽  
Difference Time

This work explores analyzing the non-quasistatic effects of a microwave circuit by employing a physical model-based field-circuit co-simulation method. Specifically, it uses the semiconductor physical model to characterize the semiconductor devices, and simulates the lumped circuit by cooperating semiconductor physical equations into Kirchhoff’s circuit equations. Then the lumped circuit simulation is hybridized with the finite-difference time-domain (FDTD) simulation by interfacing EM (electromagnetic) field quantities with lumped-element quantities at each timestep. Taken a microwave limiter circuit as an example, the simulation results agree well with the measured results, which prove that this method can characterize non-quasi-static effects well. As a comparison, the equivalent circuit modelbased co-simulation cannot characterize the non-quasistatic effects accurately.

scholarly journals Modulation of light absorption in flexible GeSn metal–semiconductor–metal photodetectors by mechanical bending

2020 ◽  
Vol 8 (39) ◽  
pp. 13557-13562
Author(s):  
Shu An ◽  
Shaoteng Wu ◽  
Chuan Seng Tan ◽  
Guo-En Chang ◽  
Xiao Gong ◽  
...  
Keyword(s):  
Light Absorption ◽  
Mechanical Strain ◽  
Optoelectronic Properties ◽  
Metal Semiconductor Metal ◽  
Mechanical Bending ◽  
Msm Photodetectors

We have demonstrated flexible GeSn metal–semiconductor–metal (MSM) photodetectors (PDs) by exploring the effect of mechanical strain on their optoelectronic properties.

Monolithic integration of metal-semiconductor-metal (MSM) photodetectors and optical waveguides: The use of polyimide waveguides for optical signal distribution

1996 ◽  
Vol 74 (S1) ◽  
pp. 43-46
Author(s):  
Lucie Robitaille ◽  
Claire L. Callender ◽  
Julian P. Noad
Keyword(s):  
Optical Properties ◽  
Optical Waveguides ◽  
Optical Signal ◽  
Monolithic Integration ◽  
Signal Distribution ◽  
Metal Semiconductor Metal ◽  
On Chip ◽  
Msm Photodetectors

Straight and curved polyimide waveguides have been fabricated for on-chip optical signal distribution. The optical properties of the structures at 633 and 830 nm are presented. The potential of polyimide waveguides for monolithic integration with GaAs MSM photodetectors is discussed.

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